An improved synthetic route to α(1→3)/α(1→2)-linked mannooligosaccharides has been developed and applied to a more efficient preparation of the potent anti-angiogenic sulfated pentasaccharide, benzyl Manα(1→3)-Manα(1→3)-Manα(1→3)-Manα(1→2)-Man hexadecasulfate, using only two monosaccharide building blocks. Of particular note are improvements in the preparation of both building blocks and a simpler, final deprotection strategy. The route also provides common intermediates for the introduction of aglycones other than benzyl, either at the building block stage or after oligosaccharide assembly. The anti-angiogenic activity of the synthesized target compound was confirmed via the rat aortic assay.
我们开发出了α(1→3)/α(1→2)-连接甘露寡糖的改良合成路线,并将其应用于更高效地制备强效抗血管生成硫酸化五糖--苄基 Manα(1→3)-Manα(1→3)-Manα(1→3)-Manα(1→2)-Man 十六碳硫酸酯,只需使用两种单糖结构单元。特别值得注意的是,该方法改进了两种构筑基块的制备,并采用了更简单的最终脱保护策略。该路线还提供了在构建模块阶段或在寡糖组装后引入除苄基以外的苷元的通用中间体。合成的目标化合物的抗血管生成活性已通过大鼠主动脉试验得到证实。